Detroiters can be seen climbing aboard a Michigan-Gratiot PCC streetcar on Monroe Street in downtown Detroit back in 1955, while DSR buses were also at work. The City of Detroit's owned and operated transit system operated as the Department of Street Railways (DSR) from the years 1922 to 1974.

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FROM STEEL WHEELS TO RUBBER TIRES: D.S.R. RAIL LINE ABANDONMENTS (1937-1956)(A listing of the dates when DSR streetcar lines were abandoned and converted to motor buses)